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Re: cannot debug multi-threaded programs with gdb

To: Stuart Hughes <seh@zee2.com>
Subject: Re: cannot debug multi-threaded programs with gdb
From: Daniel Jacobowitz <dan@debian.org>
Date: Fri, 13 Sep 2002 09:51:13 -0400
Cc: Linux-MIPS <linux-mips@linux-mips.org>
In-reply-to: <3D81B8D3.1609CD69@zee2.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <3D81B8D3.1609CD69@zee2.com>
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User-agent: Mutt/1.5.1i
On Fri, Sep 13, 2002 at 11:07:15AM +0100, Stuart Hughes wrote:
> Hi,
> 
> I've been trying to debug a simple multi-threaded test program using
> gdb, and it always fails as follows:
> 
> [New Thread 1024 (LWP
> 39)]                                                      
>                                                                               
>   
> Program received signal SIGTRAP, Trace/breakpoint
> trap.                         
> [Switching to Thread 1024 (LWP
> 39)]                                             
> warning: Warning: GDB can't find the start of the function at
> 0xffffffff.       
> 
> I've tried various different compilers, gdb, glibc version but the
> problem is the same.  Note that I can debug non-threaded c/c++ programs
> without any problem.  My environment is as follows:
> 
> CPU:          NEC VR5432
> kernel:       linux-2.4.10 + patches
> glibc:                2.2.3 + patches

Not enough patches I'd bet.  Glibc 2.2.3 had an incorrect size listed
for elf_gregset_t, and it was fixed in 2.2.5.  That would cause this
problem.

> gdb:          5.2/3 from CVS
> gcc:          3.1 (also tried 3.0.1)
> binutils:     Version 2.11.90.0.25
> 
> Does anyone have any idea what is wrong and how to fix it. 
> 
> Regards, Stuart
> 
> 

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

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